(-0.25a^3*b^2*c)*(5abc)=-1.25a^4*b^3*c^2
3х + 4 = 2/3х - 2
3х - 2/3х = - 2 - 4
2 1/3х = - 6
7/3х = - 6
х = - 6 : 7/3
х = - 6 * 3/7
х = - 18/7
<span>х = - 2 4/7</span>
Первый (2;-4) а второй подожди
(7t - 3)(-7t + 3) = -49t² + 21t + 21t - 9 = -49t² + 42t - 9